Electric brake system

Patent metadata

Field	Value
Publication number	US-2019366997-A1
Application number	US-201916425869-A
Country	US
Kind code	A1
Filing date	May 29, 2019
Priority date	May 30, 2018
Publication date	Dec 5, 2019
Grant date	—

Abstract

An electronic brake system of the present disclosure is disclosed. The an electronic brake system may include a reservoir to store oil: a master cylinder having a master piston connected to a brake pedal and a master chamber for discharging oil by a displacement of the master piston; a hydraulic pressure supply apparatus generating hydraulic pressure by an electrical signal output corresponding to a displacement of the brake pedal to supply to wheel cylinders of the respective wheels; a hydraulic control unit transmitting the hydraulic pressure discharged from the hydraulic pressure supply apparatus to the wheel cylinders of the respective wheels; and a redundancy control apparatus generating hydraulic pressure using a motor and a pump to transmit to at least one of the wheel cylinders.

First claim

What is claimed is:

1 . An electronic brake system comprising:
a reservoir to store oil; a master cylinder having a master piston connected to a brake pedal and a master chamber for discharging oil by a displacement of the master piston; a hydraulic pressure supply apparatus generating hydraulic pressure by an electrical signal output corresponding to a displacement of the brake pedal to supply to wheel cylinders of the respective wheels; a hydraulic control unit having a first hydraulic circuit for controlling the hydraulic pressure transmitted to the two wheel cylinders and a second hydraulic circuit for controlling the hydraulic pressure transmitted to the other two wheel cylinders, and transmitting the hydraulic pressure discharged from the hydraulic pressure supply apparatus to the wheel cylinders of the respective wheels; a simulation apparatus for providing a reaction force in accordance with a pedal effort of the brake pedal; a reservoir passage connecting the reservoir and the master chamber; a backup passage connecting the master chamber to the first hydraulic circuit and the second hydraulic circuit; a branch passage connecting the master chamber and the simulation apparatus; and a redundancy control apparatus provided between the hydraulic control unit and the wheel cylinders, and generating hydraulic pressure using a motor and a pump to transmit to at least one of the wheel cylinders.

2 . The electronic brake system according to claim 1 ,
wherein the redundancy control apparatus comprises: an isolation valve closed to prevent the hydraulic pressure transmit from the hydraulic control unit to the wheel cylinders in the event of a system abnormality, a pump for receiving and pressurizing oil from the reservoir, a motor for driving the pump, and a switching valve provided between the pump and the wheel cylinders to control the flow of oil pressurized by the pump.

3 . The electronic brake system according to claim 2 ,
wherein the hydraulic control unit includes a first circuit flow passage connected to any one of the wheel cylinders and a second circuit flow passage connected to the other wheel cylinders, the isolation valve includes a first isolation valve provided in the first circuit o passage and a second isolation valve provided in the second circuit flow passage.

4 . The electronic brake system according to claim 3 ,
the redundancy control apparatus further comprises a connection flow passage for connecting a downstream side of the first isolation valve and a downstream side of the second isolation valve.

5 . The electronic brake system according to claim 4 ,
wherein the pump is provided in a pair, and the pair of pumps is provided between the connection flow passage and the reservoir.

6 . The electronic brake system according to claim 5 ,
wherein the switching valve is provided in the connection flow passage, and includes a first switching valve for controlling the flow of oil toward the first circuit flow passage and a second switching valve for controlling the flow of oil toward the second circuit flow passage.

7 . The electronic brake system according to claim 3 ,
wherein the hydraulic control unit includes a plurality of inlet valves for controlling the flow of oil supplied to each of the wheel cylinders, the first circuit flow passage and the second circuit flow passage are connecting between a downstream of the inlet valves and the wheel cylinders, respectively.

8 . The electronic brake system according to claim 1 ,
wherein the redundancy control apparatus operates in a fallback mode.

9 . An electronic brake system comprising:
a reservoir to store oil; a master cylinder having a master piston connected to a brake pedal and a master chamber for discharging oil by a displacement of the master piston; a hydraulic pressure supply apparatus generating hydraulic pressure by an electrical signal output corresponding to a displacement of the brake pedal to supply to wheel cylinders of the respective wheels; a hydraulic control unit having a first hydraulic circuit for controlling the hydraulic pressure transmitted to the two wheel cylinders and a second hydraulic circuit for controlling the hydraulic pressure transmitted to the other two wheel cylinders, and transmitting the hydraulic pressure discharged from the hydraulic pressure supply apparatus to the wheel cylinders of the respective wheels; and a redundancy control apparatus provided between the hydraulic control unit and the wheel cylinders, and generating hydraulic pressure using a motor and a pump to transmit to at least one of the wheel cylinders, wherein the redundancy control apparatus comprises: an isolation valve closed to prevent the hydraulic pressure transmit from the hydraulic control unit to the wheel cylinders in the event of a system abnormality, a pump for receiving and pressurizing oil from the reservoir, a motor for driving the pump, and a switching valve provided between the pump and the wheel cylinders to control the flow of oil pressurized by the pump.

10 . The electronic brake system according to claim 9 , further comprising:
a backup passage directly connecting the master cylinder to the first hydraulic circuit and the second hydraulic circuit without a valve intervention.

11 . The electronic brake system according to claim 10 ,
wherein the backup passage provides with a check valve to block the flow of oil flowing into the master cylinder from the hydraulic pressure supply apparatus while allowing the flow of oil flowing from the master cylinder to the first hydraulic circuit and the second hydraulic circuit.

12 . The electronic brake system according to claim 11 ,
the backup passage further comprises a first backup passage for connecting the master cylinder and the first hydraulic circuit and a second backup passage for connecting the master cylinder and the second hydraulic circuit.

13 . The electronic brake system according to claim 12 ,
the check valve includes a first check valve provided in the first backup passage and a second check valve provided in the second backup passage.

14 . The electronic brake system according to claim 10 ,
wherein the redundancy control apparatus operates in a fallback mode.

Assignees

• Mando Corp

Inventors

• Jeong Hyojin
• Lim Eun-Seong

Classifications

• B60T13/745

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T13/142 Primary

  Systems with master cylinder · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title

• B60T7/042 Primary

  by electrical means, e.g. using travel or force sensors · CPC title